set arbitrary railroad start date to 1/1/1900
added logging railroads in Michigan using USGS 3DEP; old route of US 131 and M-57
added logging railroads in Michigan using USGS 3DEP
added logging railroads in Michigan using USGS 3DEP
added logging railroads in Michigan using USGS 3DEP
added logging railroads in Michigan using USGS 3DEP
added logging railroad spurs in Michigan using USGS 3DEP
added logging railroad spurs in Michigan using USGS 3DEP
added logging railroad spurs in Michigan using USGS 3DEP
extended logging railroad to log dump along river using USGS 3DEP
added logging railroad spurs in Michigan using USGS 3DEP
added logging railroad spurs in Michigan using USGS 3DEP
added logging railroad spurs using USGS 3DEP
added logging railroad spur using USGS 3DEP
added logging railroads in Central Upper Peninsula of Michigan using USGS 3DEP
added logging railroads in Central Upper Peninsula of Michigan using USGS 3DEP
added logging railroads in Central Upper Peninsula of Michigan using USGS 3DEP
added logging railroads in Alger County, Michigan using USGS 3DEP